If you click the "List Available Servers" above the drop-down box you showed, does it give an error, or do the OPC servers get added to the list?
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Just a note; to locate remote OPC Server, the interface uses OPCEnum. So, make sure that it is running on the remote machine. When it is browsing the local machine, it searches for ProgIDs with "OPC" sub-key in the registry, but with OPCEnum, the "OPC" registry key is not used. We invoke COM methods exposed by OPCEnum; OPCEnum does the work and gets a list of OPC Servers for us.
Also, make sure that you hit the "List Available Severs" as Steve mentioned.